【摘要】 采用热分解法制备了新型IrO₂-CeO₂-G/Ti复合电极。采用SEM、TEM、XRD和XPS等测试手段分别对不同IrO₂含量的电极进行表征。采用循环伏安法、恒流充放电法和电化学阻抗谱法对电极的电化学行为进行研究。结果表明,IrO₂涂覆载量为2.5 mg/cm²的电极具有最大的比电容值459.5 F/g。在5 mA/cm²电流密度下,经5000次充放电循环后IrO₂涂覆载量为2.5 mg/cm²电极比电容仍能保持97.8%。该种复合电极材料因其独特的元素组成和良好的赝电容性能,是一种理想的超级电容器电极材料。更多还原

【Abstract】 The novel IrO₂-CeO₂-G/Ti composite electrodes were prepared by thermal decomposition method. The synthesized electrodes with different IrO₂ content were characterized by scanning electron microscope（SEM）, transmission electron microscope（TEM）, X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）. The electrochemical performances of the electrodes were investigated by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy in 0.5 mol/L H₂SO₄ solution. The results show that the electrode with 2.5 mg/cm² IrO₂ exhibits an excellent specific capacitance value of 459.5 F/g, and maintains the specific capacitance at about 97.8% after 5000 charge-discharge cycles at 5 mA/cm² current density. The electrode with 2.5 mg/cm² IrO₂ is an ideal electrode for supercapacitor due to its unique composition proportion and the excellent pseudocapacitance property.更多还原